Abstract
This letter presents a geometrical study of grain-boundary sliding stimulated by intragranular slip in a compatible zinc bicrystal with a symmetric 90o,<1010> tilt boundary. Assuming that the interaction of lattice dislocations with the boundary produces glissile grain-boundary dislocations of two different signs, an analysis of the possibility of their contribution to sliding has been made. It is shown that these grain-boundary dislocations can induce only local grain-boundary sliding and hence cannot contribute to usual macroscopic grain-boundary sliding. It is suggested that the reason for the increase in the grain-boundary sliding rate in the presence of intragranular slip is the facilitation of the accommodation of grainboundary sliding at boundary irregularities by the emission of lattice dislocations to the grain interior.
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